I've never used Windows 10 before. I tried to connect from Windows 7 to Windows 10 via Remote Desktop but it failed. Sorry, but I don't remember the error message. After that I read somewhere in the internet that I have to create an .rdp file with the contents:

enablecredsspsupport:i:0
authentication level:i:2

and to open this file in the connection dialog before I connect. I did it and I could connect to Windows 10. I could see the remote screen with my user name and password prompt. But after I typed the password the error appeared:

The user name or password is incorrect

But they are both correct because I use the notebook without Remote Desktop and can login. I also read somewhere in the internet that Windows 10 provides 2 sign-in options: PIN and password. I know that I use PIN. Can this be the issue?